Index: firmware/App/Modes/TreatmentRecirc.c
===================================================================
diff -u -r0a4dcd288d4347b85baaa0b07da568b6add5eac7 -r82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215
--- firmware/App/Modes/TreatmentRecirc.c	(.../TreatmentRecirc.c)	(revision 0a4dcd288d4347b85baaa0b07da568b6add5eac7)
+++ firmware/App/Modes/TreatmentRecirc.c	(.../TreatmentRecirc.c)	(revision 82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215)
@@ -191,6 +191,7 @@
 {
     // Count time in this sub-mode
     recircTimerCtr++;
+    TREATMENT_RECIRC_STATE_T priorSubState = treatmentRecircState;
 
     switch ( treatmentRecircState )
     {
@@ -207,6 +208,10 @@
             break;
     }
 
+    if ( priorSubState != treatmentRecircState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, treatmentRecircState );
+    }
     // Re-circulate flags should be handled by now - reset in case not handled by current state
     resetTreatmentRecircFlags();